barnes



(No Model.)

D. L. BARNES.

GA'R BRAKE.

Patented Apr. 21', 1891.

"mum

UNITED STATES PATENT OFFICE.

DAVID L. BARNES, OF CHICAGO, ILLINOIS, ASSIGNOR TO ELIZABETH II. FROST, OF SAME PLACE.

CAR-BRAKE.

SIPECIFICA'IION forming part of Letters Patent Itl'o. 450,948, dated April 21, 1891. Application filed January 19, 1891. Serial No. 378,255. (No model.)

To all whom it may concern.-

Be it known that I, DAVID L. BARNES, a citizen of the United States, residing at Ohicago, Cook county, Illinois, have invented a new and useful Improvement in Car-Brakes, of which the following is a specification.

My present invention relates particularly to the construction of the brake-beam, and has for its object the production of a simple, easily constructed, and serviceable beam; and the invention consists in the features and details of construction hereinafter described and claimed.

In the drawings, Figure 1 is a plan View of my improved beam; Fig. 2, an end view of the brake head and shoe shown at the left hand of Fig. 1; and Fig. 3, a section on line 3 of Fig. 1, looking in the direction of the arrow, the last two figures being upon an enlarged scale.

In making my improved beam I take a piece of square pipe A of suitable dimensions and bend it preferably into the form shown in Fig. 1, the ends being preferably bent back to enable them to easily enter the sockets in the brake-heads.

The brake-head B, in so far as the method of attaching the shoe 0 thereto is concerned, is made in any of the ordinary forms, and this part of its construction deserves no particular description. The brake-head, however, is further provided with asquare socket D of suitable dimensions to receive the end of the pipe A, and also with a slot or opening of suitable size to allow a strap E to pass through the same, and with an offset c in its outer surface intended to receive the end of this strap,as hereinafter described. The strap E consists of a piece of malleable iron of suitable dimensionsas, for instance, threeeighths of an inch thick and two inches broad and of a length depending upon the length of the beam.

The strut F may be made of any suitable form, having at one enda square hole, through which the pipe A is passed, and at the other a shoulder 'or rib f, intended to prevent the strap E from slipping off. The strut is also provided with a mortise or slot G, through which the brake-lever passes, and with lugs or shoulders II, to which a hanger may be at tached to aiford additional support for the brake-beam, and which aid the shoulder f in preventing the slipping of the strap E.

The parts being constructed are put together in the following manner: The strut is first slipped over the pipe A, and the brakeheads then passed over the ends thereof. The strap is then heated to a proper temperature and bent over the strut, and its ends passed through the slots in the brake-heads and then bent back, as shown, into the grooves or recesses 6, thereby preventing the strap from being withdrawn. When the strap cools, it will of course contract and draw the brakeheads tightly onto the pipe, bind the strut in place, and hold all of the parts firmly together.

Although I have shown in the drawings and described thus far in the specification a square pipe as being the form in which my beam is made, this is merely for convenience and brevity, and I do not desire to be understood as limiting myself to the use of a square pipe solely, since a rectangular pipe of any sort can be used with equal advantage, andI contemplate so using it. Of course when using other forms of rectangular pipe the sockets in the brake-heads and the hole in the strut should be made of a shape to correspond to the form of the pipe used.

The pipe of rectangular cross-section, which I prefer to use, has advantages over the round pipe shown in my patent, No. 438,673, granted to me October 21, 1890, inasmuch as it does not admit of atwisting strain, causing the socket-pieces to work loose. It also forms a better bearing for the post between the truss-rod and the pipe. In addition to these advantages, it is more easily held in the clamp or former during the process of manufacture.

I claim 1. The combination of a rectangular pipe and the combined socket-pieces and brakeheads, substantially as described.

2. The combination of the rectangular pipe, the combined brake-heads and socket-pieces, and the strap, substantially as described.

3. The combination of a rectangular pipe, brake-heads provided with sockets to receive the ends of the pipe, and a strap having its the brake-heads and fastened, holding the ends passed through slots in thebrake-heads parts of the beam in place, substantially as 10 substantially parallel to the pipe, substandescribed. tially as described. 7 5 4. The combination of a rectangular pipe, DAVID LARNES the brake-heads provided with sockets to rev \Vitnesses: ceive the ends of the pipe, a strut, and a strap CHARLES J ENCKES BARNES, passed over the strut and through slots in SAMUEL E. HIBBEN. 

